if it follows how all the other Avalon's work , one PI can control 6 or more, from what they are saying you may be able to chain a lot more to gather. tip there is a  internal controller so be very care full with updates you can brick one .

and it works on orange PI's now unless they dropped that , me and Avalon had a little falling out over gear i didn't buy direct they pretty much told go me f off unless i had bought it direct or pay very high price to replace some thing that should only cost 30 bucks and they give no support to non direct buys . so i stop keeping up on the Avalon 7 . and CGMMINER only works unless you are willing to send a miner to Luke the DEV of BFG hell make it work or convince Avalon to do it . Avalon did support BFG at one point not sure what happen .